Electronic controller unit for a piano



FIG. 1 is a top, front perspective view of an electronic controller unit for piano showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left-side view thereof; and,

FIG. 7 is a right-side view thereof. 

The ornamental design for electronic controller unit for a piano, as shown. 